It's a little shorter if you unconditionally concat & repeat.
(defn append-val [val & colls]
(let [maxlen (apply max (map count colls))]
(map #(concat % (repeat (- maxlen (count %)) val)) colls)))
user> (apply map + (append-val 0 [1] [2 3] [4 5 6]))
(7 8 6)
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